as though 好像，仿佛
as to 至于，关于
as well 也，又
as well as (除……之外)也，既……又
not as/so...as 不如……那样
back and forth 往返，来来往往地
back of 在……后部，在……背部
because of 由于，因为
had better 最好还是，应该
both...and 既……又……，两个都
but for 除……以外，倘没有，除非
each other 互相
either...or 或……或，不是……就是；无论……还是
or else 否则，要不然
even if/though 即使，虽然
even then 即使那样，连，都
点睛：应用范围广泛的词组学习
【例句】Crows all but destroyed a farmer's field of corn.
乌鸦几乎把农夫田里的玉米都吃光了。
【例句】But for music (=Were it not for music), life would be dull.
要不是有音乐，人生会很无聊。